This has been tested using CO2 and does not have any leaks. This marker will only work with CO2 (Will not work using HPA). I Have wrapped everything in plastic, bubble wrap, and/or paper when packing this.This item is in the category "Sporting Goods\Outdoor Sports\Paintball\Paintball Markers". The seller is "custompaintballmarkers" and is located in this country: US. This item can be shipped to United States.